diff --git a/crates/tauri-runtime/src/lib.rs b/crates/tauri-runtime/src/lib.rs
index b1c06f397721..cf3a68c8c1a2 100644
--- a/crates/tauri-runtime/src/lib.rs
+++ b/crates/tauri-runtime/src/lib.rs
@@ -438,12 +438,8 @@ pub trait Runtime<T: UserEvent>: Debug + Sized + 'static {
   fn run_iteration<F: FnMut(RunEvent<T>) + 'static>(&mut self, callback: F);
 
   /// Equivalent to [`Runtime::run`] but returns the exit code instead of exiting the process.
-  ///
-  /// Note: This function only has a default impl to avoid a semver-incompatible change.
   #[cfg(desktop)]
-  fn run_return<F: FnMut(RunEvent<T>) + 'static>(&mut self, callback: F) -> i32 {
-    unimplemented!("Runtime::run_return is not implemented")
-  }
+  fn run_return<F: FnMut(RunEvent<T>) + 'static>(&mut self, callback: F) -> i32;
 
   /// Run the webview runtime.
   fn run<F: FnMut(RunEvent<T>) + 'static>(self, callback: F);